GM Service Manual Online
For 1990-2009 cars only

Application

Specification

Metric

English

Camshaft

  • Bearing Cap Oil Clearance - Standard
    • Bearing Cap No. 1

0.035-0.076 mm

0.0014-0.0030 in

  • Bearing Cap Oil Clearance - Standard
    • Bearing Caps No. 2,3,4,5

0.035-0.072 mm

0.0014-0.0028 in

  • Bearing Caps Oil Clearance - Maximum

0.10 mm

0.0039 in

  • Journal Outside Diameter - Standard
    • No. 1 Journal

34.449-34.465 mm

1.3562-1.3568 in

  • Journal Outside Diameter - Standard
    • No. 2,3,4,5 Journal

27.949-27.965 mm

1.1003-1.1010 in

  • Lobe Height Exhaust - Minimum
    • No. 1 Lobe

39.86 mm

1.5693 in

  • Lobe Height Exhaust - Minimum
    • No. 2 Lobe

38.71 mm

1.5240 in

  • Lobe Height Exhaust - Standard
    • No. 1 Lobe

40.019-40.119 mm

1.5727-1.5766 in

  • Lobe Height Exhaust - Standard
    • No. 2 Lobe

38.863-38.963 mm

1.5273-1.5312 in

  • Lobe Height Intake - Minimum
    • Lobe No. 1

40.45 mm

1.5925 in

  • Lobe Height Intake - Minimum
    • Lobe No. 2

38.61 mm

1.5201 in

  • Lobe Height Intake - Standard
    • Lobe No. 1

40.607-40.707 mm

1.5958-1.5997 in

  • Lobe Height Intake - Standard
    • Lobe No. 2

38.769-38.869 mm

1.5236-1.5275 in

  • Runout - Maximum

0.03 mm

0.0012 in

  • Thrust Clearance - Standard

0.04-0.14 mm

0.0016-0.0055 in

  • Thrust Clearance (Maximum)

0.15 mm

0.0059 in

Connecting Rods and Bearings

  • Connecting Rod Bearing Clearance - Maximum

0.080 mm

0.0031 in

  • Connecting Rod Bearing Clearance - Standard

0.028-0.052 mm

0.0011-0.0020 in

  • Connecting Rod Bolt Diameter - Minimum

6.4 mm

0.252 in

  • Connecting Rod Bolt Diameter - Standard

6.0-6.7 mm

0.260-0.264 in

  • Connecting Rod Bow - Maximum

0.050 mm

0.0020 in

  • Connecting Rod Bushing Inside Diameter

20.011-20.023 mm

0.7878-0.7883 in

  • Connecting Rod Side Clearance - Maximum

0.35 mm

0.0138 in

  • Connecting Rod Side Clearance - Standard

0.160-0.342 mm

0.0063-0.0135 in

  • Connecting Rod Thickness

19.788-19.840 mm

0.7791-0.7811 in

  • Connecting Rod Twist - Maximum

0.15 mm

0.0059 in

  • Rod Bearing Thickness - "1" Stamping

1.482-1.486 mm

0.0583-0.0585 in

  • Rod Bearing Thickness - "2" Stamping

1.486-1.490 mm

0.0585-0.0587 in

  • Rod Bearing Thickness - "3" Stamping

1.490-1.494 mm

0.0587-0.0588 in

  • Rod Bushing Oil Clearance - Piston To Piston Pin

0.005-0.0013 mm

0.0002-0.0005 in

Crankshaft

  • Crankshaft Diameter

43.992-44.000 mm

1.7320-1.7328 in

  • Crankshaft Diameter Out-of-Round and Taper - Maximum

0.02 mm

0.0004 in

  • Journal Taper or Out-of-Round

0.02 mm

0.0008 in

  • Runout at Center Journal

0.03 mm

0.0012 in

  • Thrust Bearing Thickness

1.930-1.980 mm

0.0760-0.0780 in

  • Thrust Play - Maximum

0.30 mm

0.0118 in

  • Thrust Play - Standard

0.04-0.24 mm

0.0016-0.0094 in

Cylinder Head

  • Gasket Surface Distortion - Maximum

0.2 mm

0.008 in

  • Seating Distortion Exhaust Manifold

0.3 mm

0.012 in

  • Seating Distortion Intake Manifold

0.2 mm

0.008 in

Cylinder Block

  • Cylinder Bore - Standard

79.000-79.013 mm

3.1102-3.1107 in

  • Cylinder Bore - Maximum

79.013 mm

3.1107 in

  • Gasket Surface Distortion - Maximum

0.05 mm

0.0020 in

Flywheel

  • Flywheel Face Runout

0.1 mm

0.004 in

Main Bearings

  • Crankshaft Journal Diameter - "0" Stamping

47.998-48.000 mm

1.8897-1.8898 in

  • Crankshaft Journal Diameter - "1" Stamping

47.996-47.998 mm

1.8896-1.8897 in

  • Crankshaft Journal Diameter - "2" Stamping

47.994-47.996 mm

1.8895-1.8896 in

  • Crankshaft Journal Diameter - "3" Stamping

47.992-47.994 mm

1.8894-1.8895 in

  • Crankshaft Journal Diameter - "4" Stamping

47.990-47.992 mm

1.8893-1.8894 in

  • Crankshaft Journal Diameter - "5" Stamping

47.988-47.990 mm

1.8892-1.8893 in

  • Crankshaft Thrust Washer Clearance - Maximum

0.08 mm

0.0031 in

  • Crankshaft Thrust Washer Clearance - Standard

0.016-0.032 mm

0.0006-0.0013 in

  • Main Bearing Thrust Clearance - Maximum

0.30 mm

0.0118 in

  • Main Bearing Thrust Clearance - Standard

0.02-0.22 mm

0.0008-0.0087 in

  • Main Bearing Thickness - "1" Stamping

1.989-1.992 mm

0.0783-0.0784 in

  • Main Bearing Thickness - "2" Stamping

1.992-1.995 mm

0.0784-0.0785 in

  • Main Bearing Thickness - "3" Stamping

1.995-1.998 mm

0.0785-0.0787 in

  • Main Bearing Thickness - "4" Stamping

1.998-2.001 mm

0.0787-0.0788 in

  • Main Bearing Thickness - "5" Stamping

2.001-2.004 mm

0.0788-0.0789 in

Timing Chain and Sprockets

  • Chain Elongation - Maximum

122.6 mm

4.827 in

  • Camshaft Sprocket Diameter With Chain - Minimum

97.3 mm

3.831 in

  • Crankshaft Sprocket Diameter With Chain - Minimum

51.6 mm

2.031 in

Oil Pump

  • Housing-to-Oil Pump Gear Set Side Clearance - Maximum

0.16 mm

0.0062 in

  • Housing-to-Oil Pump Gear Set Side Clearance - Standard

0.030-0.080 mm

0.0012-0.0031 in

  • Outer Rotor-to-Inner Rotor Tip Clearance - Maximum

0.35 mm

0.0138 in

  • Outer Rotor-to-Inner Rotor Tip Clearance - Standard

0.060-0.180 mm

0.0024-0.0071 in

  • Outer Rotor-to-Oil Pump Body Radial Clearance - Maximum

0.32 mm

0.0128 in

  • Outer Rotor-to-Oil Pump Body Radial Clearance - Standard

0.125-0180 mm

0.0049-0.0070 in

Oil Pressure

  • At Idle

29 kPa, (0.3kgf/cm2)

4.2 psi or more

  • At 3000 r/min

294-539 kPa, (3.0-5.5 kgf/cm2)

43-79 psi

Pistons

  • Diameter

81.975-81.993 mm

3.2274-3.2281 in

  • Piston-to-Cylinder Bore Clearance - Standard

0.007-0.038 mm

0.0003-0.0015 in

  • Piston-to-Cylinder Bore Clearance - Maximum

0.10 mm

0.0039 in

  • Ring End Gap - Lower Ring - Maximum

1.20 mm

0.0472 in

  • Ring End Gap - Lower Ring - Standard

0.35-0.50 mm

0.0138-0.0197 in

  • Ring End Gap - Oil Ring - Maximum

1.05 mm

0.0413 in

  • Ring End Gap - Oil Ring - Standard

0.15-0.40 mm

0.0059-0.0157 in

  • Ring End Gap - Top Ring - Maximum

1.05 mm

0.0413 in

  • Ring End Gap - Top Ring - Standard

0.25-0.35 mm

0.0098-0.0138 in

  • Ring Groove Clearance - Lower Compression Ring

0.030-0.070 mm

0.0012-0.0028 in

  • Ring Groove Clearance - Upper Compression Ring

0.020-0.070 mm

0.0009-0.0028 in

Valves

  • Guide Inside Diameter

5.510-5.530 mm

0.2169-0.2177 in

  • Head Angles for Refinishing - Seat Contact Surface

45 Degrees

  • Exhaust Valve Length - Minimum

111.3 mm

4.382 in

  • Exhaust Valve Length - Standard

111.7 mm

4.398 in

  • Intake Valve Length - Minimum

110.9 mm

4.382 in

  • Intake Valve Length - Standard

111.3 mm

4.382 in

  • Seat Contact Width

3.3 mm

0.130 in

  • Spring Deviation

1.6 mm

0.063 in

  • Spring Free Length - Exhaust

46.5 mm

1.831 in

  • Spring Free Length - Intake

46.4 mm

1.830 in

  • Stem Outside Diameter - Exhaust Valves

5.445-5.470 mm

0.2143-0.2153 in

  • Stem Outside Diameter - Intake Valves

5.460-5.475 mm

0.2150-0.2155 in

  • Stem-to-Guide Clearance - Exhaust Valves - Standard

0.030-0.073 mm

0.0011-0.0028 in

  • Stem-to-Guide Clearance - Exhaust Valves - Maximum

0.10 mm

0.0039 in

  • Stem-to-Guide Clearance - Intake Valves - Standard

0.025-0.058 mm

0.0010-0.0023 in

  • Stem-to-Guide Clearance - Intake Valves - Maximum

0.10 mm

0.0039 in

Valve Guides

  • Valve Guide Bushing Bore Diameter - Standard

10.538-10.556 mm

0.4149-0.4156 in

  • Valve Guide Bushing Bore Diameter - Maximum

10.556 mm

0.4156 in

Main Bearing Selection Formula

Cylinder Block Stamping + Crankshaft Journal Stamping =

0 - 2

3 - 5

6 - 8

9 - 11

Use Bearing Number

1

2

3

4

Main Bearing Selection Chart

Cylinder block Number mark

Crank shaft number mark

0

1

2

3

4

5

0

1

1

1

2

2

2

1

1

1

2

2

2

3

2

1

2

2

2

3

3

3

2

2

2

3

3

3

4

2

2

3

3

3

4

5

2

3

3

3

4

4

6

3

3

3

4

4

4

EXAMPLE: Cylinder block "4", Crank shaft "3", Use Bearing "3"

Crankshaft Main Bearings

Items

Specification

Metric

English

Cylinder Block Main Journal Bore Diameter (A)

  • Main Journal Bore Diameter - "0" Mark

52.000-52.003 mm

2.0472-2.0473 in

  • Main Journal Bore Diameter - "1" Mark

52.003-52.005 mm

2.0473-2.0474 in

  • Main Journal Bore Diameter - "2" Mark

52.005-52.007 mm

2.0474-2.0475 in

  • Main Journal Bore Diameter - "3" Mark

52.007-52.010 mm

2.0475-2.0476 in

  • Main Journal Bore Diameter - "4" Mark

52.010-52.012 mm

2.0476-2.0477 in

  • Main Journal Bore Diameter - "5" Mark

52.012-52.014 mm

2.0477-2.0478 in

  • Main Journal Bore Diameter - "6" Mark

52.014-52.016 mm

2.0478-2.0479 in

Crankshaft Main Journal Diameter (B)

  • Main Journal Diameter - "0" Mark

47.998-48.000 mm

1.8897-1.8898 in

  • Main Journal Diameter - "1" Mark

47.996-47.998 mm

1.8896-1.8897 in

  • Main Journal Diameter - "2" Mark

47.994-47.996 mm

1.8895-1.8896 in

  • Main Journal Diameter - "3" Mark

47.992-47.994 mm

1.8894-1.8895 in

  • Main Journal Diameter - "4" Mark

47.990-47.992 mm

1.8893-1.8894 in

  • Main Journal Diameter - "5" Mark

47.988-47.990 mm

1.8892-1.8893 in

  • Standard Bearing Center Wall Thickness - "1" Mark

1.993-1.996 mm

0.0785-0.0786 in

  • Standard Bearing Center Wall Thickness - "2" Mark

1.996-1.999 mm

0.0786-0.0787 in

  • Standard Bearing Center Wall Thickness - "3" Mark

1.999-2.002 mm

0.0787-0.0788 in

  • Standard Bearing Center Wall Thickness - "4" Mark

2.002-2.003 mm

0.0788-0.0789 in